Thermostatic control for cooling mediums



F. AK HURLBUT. THERMOSTATIC CONTROL FOR COOUNG MEDIUMS,

` APPLICATION FILED NOV-13,1918.

narran stares FRANK A. I-IURLBUT, 0F KANSAS CITY, MISSOURI.

THRMOSTATIC CONTROL FOR COOLING MEDIUMS.

Specification of Letters Patent.

Patented Auo. 3, 1920.

Application led November 13` 1918. Serial 110.2623541.

To all whom t may concern:

Be it known that I, FRANK A. HURLBUT, a citizen of the United States, residing at Kansas City,`in the county of Jackson, State of Missouri, have invented certain new and useful Improvements in Thermostatic vControl for Cooling Mediums, of which the following is ak full and exact specification.

The present invention relates to liquid circulating devices for use in connection with heated surfaces, for keeping down the temperature of such surfaces, and is particularly useful in connection with the water tubes or casings employed in furnace wall constructions, although not confined solely to suclruse. One of the objects of the invention, therefore, is to devise a cooling device provided with a circulating medium for cooling purposes, together with means for regulating the circulation of the said medium in accordance with the changes of temperature therein.

It is also an object to construct a cooling device adapted to maintain a circulating cooling medium in contact with the heated surface and under a given pressure, and provided with means acting automatically to regulate the outiiow from the device inV accordance with the temperature of said medium, for the purpose of maintaining a given substantially constanttemperature at the surface which is subjected to the heat.

For carrying out the invention Va construction has been devised which comprises a casing for containing the cooling medium and having suitable inlet and outlet points, and thermostatic means governing by temperature changes in the' medium and acting to regulate the valve which controls the outlet from the casing.

With these general objects in view, the invention will now be described with reference to the accompanying drawing illustrating one form of construction which has been devised for embodying the improvements, after which those features and combinations deemed to be novel will be set forth and defined in the appended claims.

In the drawing--v Figure 1 is a view in longitudinal section illustrating a water back construction for furnace walls, arranged in accordance with the present invention;

Fig. 2 is a vertical section, on an enlarged scale, showing the parts at the right end of Fig. 1;

Fig. 3 is a vertical section on the line III- III of Fig. 2; and

Fig. 4 is a fragmentary vertical section of a furnace bridge wall construction showing the arrangement of the water-back member with'reference to said wall.

Referring to the drawing in detail, this illustrates the circulating member for the cooling medium as lcomprising an outer tubular'water casing2 adapted to be mounted at any desired point in the furnace walk-Fig. 4 illustrating the mode of locating it in what is known as the bridge-wall 3. Within this casing 2 is mounted a feed water tube 4 extending axially through the casing 2 and provided at its outer end with a feed water pipe 6 adapted to be connected with any suitable source of water supply, or other cooling medium, preferably under suitable pressure. This feed water tube 4 is also fitted with a series of baffle elements 8 for the purpose of directing the water flow outwardl and effecting a relatively faster rate of flow along the inner face of the outer casing than past the outer face of the feed tube, as explained in my Patent 1,269,083,

issued June 11, 1918. l n

rlhe water or other circulating medium is conducted from the casing 2 by way of ports 10 provided through the head 12 of the casing and through a plate 14 and the valve casing 16, secured to they head 12'by means of bolts18 and fitted lwith gaskets 20 as shown in Fig. 2.'. Secured centrally tothe plate 14 is a thermostatic element comprising a tube 22 projecting a suitable distance withv in the casing 2 and provided withy any preferred type of thermogresponsive medium forresponding to temperature changes in thecooling medium and transmitting a corresponding action to a flexible diaphragm 24 clamped between the plate 14 and the.

valve casing 16 opposite the mouth of the tube 22. In register with the mouth of said tube 22 the valve casingv 16 is formed with Va piston passage 26 for accommodating a ports 36 in communication with the outlet passage 38 provided with the pipe connection 40. A cap 4t2, having the vent 44, is fitted on the other end of the' sleeve 34, whereby access may be had to the valve 32 for adjustment of the same in order to vary the point of cut-clito suit the working conditions of the device.

lVth the cooling medium supplied through the connection (j :to the feed tube l at a constant rate or pressure, and with the valve 32 properly adjusted, it will be apparent that ifthe temperatureaof the cooling medium begins to rise above a certain point the thermostatic element will be aected, the medium within the tube 22 ,expanding tliereby actuating `the diaphragm 2l. In the normal position of the valve 32 c., more or less nearly closed), the pressure on the outer face balances the pull exerted by the valve 32 and the pressure exerted by the thermostatic element at that temperature lat which it is desired to maintain the cooling medium, but the action of the thermostatic element increases the pressure on the adjacent face of the piston, with the result that the latter is mov-ed in a direction to open the valve 32, thereby permitting some of the water to leave the casing 2 and additional water toente the same through the feed tube 4. rihis will of course act to f check the rise in temperature, and as this becomes normal the pressure on the inner face of the piston diminishes, due to contraction in the medium within the therinostatic tube, and said pressure will diminish until the piston has receded sufliciently to rstore the valve 32 to its original position.` This original position of the valve 32 may of course be such as toleave the youtlet ports normally slightly open soy as to permit a certain degree of movement of the cooling medium at all times, and the thermostatic control will then act `to yiii-v crease or decrease the flow in accordance with the temperature changes taking place in the outgoing water.

It will thus be seen that a simple, eflicient and compact arrangement and construction have been devised for carrying out thepurposes of the invention, the valve action be- `ing at all times automatic and dependent upon the temperature of the cooling meof the piston 28 substantially dium as it leaves the device and serving to maintainsaid cooling medium at a substantially constant temperature by regulating the flow in accordance with any change taking place in the temperature of the inedium in the vicinity of the outlet from the casing." lWhile the foregoing illustrates,

comprising a casing arranged to maintainl a liquid cooling medium in contact with a heated surface and under suitable pressure, said casing being provided with yan outlet valve, and tliermostatic means including a piston member connected with said valve and having one of its faces exposed to the liquid as it approaches said valve, and a thermostatic element projecting within said casing and mounted in engagement with the opposite face of said piston member 2; A cooling device for heated` surfaces, comprising a casing' arranged to maintain a liquid cooling medium inV contact with 'a heated surface, said casingbeing provided with a valve for regulating `the flow of said medium through the casing, a piston member connected to said valve and having one of its faces exposed to said medium, and a thermostatic element mounted in said medium and in engagement with the opposite face of said piston, whereby said valve actuated in `accordance with the temperature changes 'in said medium.

3. A water back Y construction for furnaces comprising a water casing provided with a feed tube and an outlet valve, a piston operativelyconnected with said valve and having one of its faces exposed to the water pressure in said casing, and a therniostatic element carried within the casing and `mounted in operative relation to the opposite face of said piston, whereby said valveis actuated in accordance with the temperature changes in the water contained in said casing. a

In witness whereof I hereto affix my sig-y 

